I question the fact that you never have trouble getting power down. At stock boost pressure the rear end will step out at full throttle in second. What tires are you running? I've got TT rears at all 4 corners and BFG T/A KDW's 245/45ZR16.
"The 300ZX Turbo is a dance; it's a song; it's rolling, roaring automotive art. There is no color that doesn't suit it. There is no mood-lifting chemical substance it can't replace." - Automobile Magazine